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- W1980442947 abstract "We consider the space-time variation of gauge couplings in brane-world models induced by the coupling to a bulk scalar field. A variation is generated by the running of the gauge couplings with energy and a conformal anomaly while going from the Jordan to the Einstein frame. We indicate that the one-loop corrections cancel implying that one obtains a variation of the fine structure constant by either directly coupling the gauge fields to the bulk scalar field or having bulk scalar field dependent Yukawa couplings. Taking into account the cosmological dynamics of the bulk scalar field, we constrain the strength of the gauge coupling dependence on the bulk scalar field and relate it to modifications of gravity at low energy." @default.
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- W1980442947 date "2003-12-17" @default.
- W1980442947 modified "2023-09-25" @default.
- W1980442947 title "Gauge coupling variation in brane models" @default.
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- W1980442947 doi "https://doi.org/10.1103/physrevd.68.123519" @default.
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